Process for the manufacturing of acrylic organopolysiloxanes

Abstract

This invention enables the selective and easy manufacturing of acrylic organopolysiloxanes which are cured by the irradiation of UV light, by the reaction of the hydroxyl group containing organosilicon compounds (A) of formula (1): ##STR1## wherein each R 1 independently is a substituted or an unsubstituted monovalent hydrocarbon group, and n designates integers from 1 to 10,000 with the acrylic group containing silane compounds (B) of formula (2): ##STR2## wherein each R 2 and R 3 independently is a substituted or an unsubstituted monovalent hydrocarbon group, R 4 is either a hydrogen atom or a methyl group, and each of a and b is an integer from 1 to 3, in the presence of a divalent tin compound of formula (3): SnX.sub.2 wherein each X independently is a halogen atom, alkoxy group, or a residue of a carboxyl group, in order to produce the acrylic organopolysiloxanes of formula (4): ##STR3## wherein R 1 through R 4 , n, a and b are described as above.

We claim: 
     
       1. A process for the production of an acrylic organopolysiloxane, comprising reacting a hydroxyl group containing organosilicon compound (A) of formula (1): ##STR13## wherein each R 1  independently is a substituted or an unsubstituted monovalent hydrocarbon group, and n is an integer from 1 to 10,000, with an acrylic group-containing silane compound (B) of formula (2): ##STR14## wherein each of R 2  and R 3  independently is a substituted or an unsubstituted monovalent hydrocarbon group, R 4  is a hydrogen atom or a methyl group, and each of a and b independently is an integer from 1 to 3, in the presence of a divalent tin compound of formula (3):   SnX.sub.x                                                  ( 3)     wherein each X independently is a halogen atom, an alkoxy group, or the residue of carboxylic acid, to produce an acrylic organopolysiloxane of formula (4): ##STR15## wherein R 1  through R 4 , n, a and b are as described above.   
     
     
       2. A process according to claim 1, wherein R 1 , R 2  and R 3  are each independently alkyl, alkenyl, cycloalkyl, aryl, aralkyl of 1-10 carbon atoms, each optionally substituted by halogen or cyano. 
     
     
       3. A process according to claim 1, wherein R 1  is methyl, ethyl, propyl, butyl, hexyl, octyl, vinyl, allyl, butenyl, hexenyl, cyclohexyl, phenyl, tolyl, benzyl, 2-phenyl ethyl, chloromethyl or 3,3,3-trifluoropropyl. 
     
     
       4. A process according to claim 1, wherein R 2  is C 1-10  -alkyl or alkoxy-substituted alkyl with 1 to 10 carbon atoms. 
     
     
       5. A process according to claim 3, wherein R 2  is C 1-10  -alkyl or alkoxy-substituted alkyl with 1 to 10 carbon atoms. 
     
     
       6. A process according to claim 1, wherein organosilicon compound (A) is: ##STR16## 
     
     
       7. A process according to claim 1, wherein silane compound (B) is ##STR17## 
     
     
       8. A process according to claim 1, wherein the divalent tim compound is SnCl 2 , SnBr 2 , SnI 2 , Sn(OOCCH 3 ) 2 , SnC 2  O 4 , Sn(OOCC 7  H 15 ) 2 , Sn(OMe) 2  or Sn(OOCC 15  H 31 ) 2 .